If you use Windows Instant Messenger, do this:
In the Options tab under 'Personal', Click the 'show song information.....' box
If you use Windows Media Player, click options>plug-ins, highlight 'background' and click the 'display song in messenger' box.
Now, everyone who has you in their contact list will be shown what you are listening to.
For those of you that don't know, I have almost 30Gb of music on a portable hard drive (I have over 800 CDs)
We use WinIM at work in lieu of phones or e-mail.
So now, everyone at work got to see when I was listening to "Too Drunk To Fuck" by the Dead Kennedys.